Grand Theft Auto IV: The Lost and Damned Walkthrough & Strategy Guide

The drive will ultimately bring you to a warehouse off of Attica Avenue. But getting there is another issue entirely. You'll have to follow the dealer as he takes a rather ridiculously long-winded and roundabout route to his location. You mustn't get too close to him, because he'll notice you following him if he does. Then again, you can't stray too far or you'll lose him (keeping him on your HUD and following way behind simply isn't an option). So, just take it easy, tailing him from a distance. If Manny warns you you're too close, then back off, but keep following. When you arrive at your destination on Attica Avenue, simply pull behind the dealer's car to begin the next leg of the mission.

Getting into the warehouse where the dealers are isn't as easy as it may seem. You can't go through the door the dealer went through, and although Manny will send you a text to hint at going through a window, no window is available. You actually have to climb the fire escape of the adjacent building to that building's roof, and then cross some pieces of plank wood back to the building in question. Once there, seek out an open skylight to breach the building itself.